Period super late + comically negative test

Hey yall! so im just wondering if anyb has had similar experience but my periods been late abt 2 wks now and today i took dollar tree test and not a DROP of dye on that test line i tell you, i know stress and smoking and not eating good can make it late and ive been doing alot of all three for past month (im nursing student in finals week i really cant help the stress lol) but should i test again? i figure two wks out and abt 4/5 wks from last sexual encounter (which was around when i was supposedly ovulating) if i was preggo the test line would have LIT up